two plane mirrors are at right angles to each other. a man stands between them and combs his hair with his right hand. in how many of the images will he be seen using his right hand? none 1 2 3

Answers

Answer 1

Answer:

Explanation:

In the first two images the comb would be in the left hand of the man. The image which appears in between those two images has the comb in its right hand. Therefore, the images in which he will be seen using his right hand is one.

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When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A.-2

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Answers

The oxygen atom, before it gains these two electrons, has a neutral charge, meaning that it has as many protons as electrons. After it gains 2 electrons, it has 2 more electrons than protons. Each electron has a charge of -1, so the whole molecule will have a charge of -2. The correct answer is a)!

Answer:

A is the corect answer

Explanation:

Cells with similar preferences are arranged closer together in the auditory cortex.

Answers

Cells with similar preferences are arranged closer together in the auditory cortex. That statement presented is True. Auditory cortex is in the temporal lobe. It processes auditory information in human and as well as other invertebrates. The neurons inside the auditory cortex are organized depends on the frequency of the sound.

Answer: TRUE for ED2020!! I just took the quiz, good luck!! stay safe and healthy!!

The Earth's _____is what gives us day and night

1. Orbit
2. Rotation
3.Revolution

Answers

Answer: 2nd option, Rotation

I hope this helps, and Stay Safe! :)

Answer:

rotation

Explanation:

............................

The change in pitch of a train's horn as it passes while you are standing still can be explained bya. sympathetic vibration.
b. ultrasonic vibrations.
c. resonance.
d. the Doppler effect.

Answers

The change in pitch of a train's horn as it passes while you are
standing still can be described by the Doppler effect, but that
doesn't explain it.

A spring gains 2.34 joules of elastic potentialenergy as it is compressed 0.250 meter from its
equilibrium position. What is the spring constant
of this spring?
(1) 9.36 N/m (3) 37.4 N/m
(2) 18.7 N/m (4) 74.9 N/m

Answers

The correct answer to the question is: 4) 74.9 N/m.

EXPLANATION:

As per the question, the stretched length of the spring is given as x = 0.250 m.

The potential energy gained by the spring is given as 2.34 joules.

We are asked to calculate the spring constant of the spring.

The potential energy gained by the spring is nothing else than the elastic potential energy .

The elastic potential energy of the spring is calculated as -

Potential energy P.E = $(1)/(2)kx^2$

⇒k = $(2P.E)/(x^2)$

= $(2* 2.34)/((0.250)^2)\ N/m$

= 74.88 N/m

= 74.9 N/m. [ans]

Hence, the force constant of the spring is 74.9 N/m.

Elastic energy equals 1/2 k(spring constant) *Δx^2(change in position) so you set the energy of the spring equal to the 1/2kΔx^2 and solve for K. 2.34=1/2k(.250)^2 which gives you a spring constant of 74.9 N/m.

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